最新FCKEditor ASP上传绕过漏洞

admin

exploiut-db：

3 ~$ z3 M/ f; F( ]) b. [FCKEditor ASP Version 2.6.8 File Upload Protection Bypass

5 ]6 q9 C+ w( p  b) T4 G- Title: FCKEditor 2.6.8 ASP Version File Upload Protection bypass
7 V  I4 U9 i. M- Credit goes to: Mostafa Azizi, Soroush Dalili
- Link:http://sourceforge.net/projects/fckeditor/files/FCKeditor/
+ h! V/ s0 O& e: F0 {9 ^- Description:
There is no validation on the extensions when FCKEditor 2.6.8 ASP version is
; A2 x  H' A/ gdealing with the duplicate files. As a result, it is possible to bypass
the protection and upload a file with any extension.
( Q5 D, P5 b& [1 n& Z  [- Reference: http://soroush.secproject.com/blog/2012/11/file-in-the-hole/
) r; E* u# h; s+ n" d$ X: S- Solution: Please check the provided reference or the vendor website.
- PoC:http://www.youtube.com/v/1VpxlJ5 ... ;rel=0&vq=hd720
" _1 g* f7 x8 D/ r"
Note: Quick patch for FCKEditor 2.6.8 File Upload Bypass:
In “config.asp”, wherever you have:
- A2 l; z1 l/ @$ J" {. H      ConfigAllowedExtensions.Add    “File”,”Extensions Here”
Change it to:
      ConfigAllowedExtensions.Add    “File”,”^(Extensions Here)$”



- K( O" f% k; Z. @3 L
" j  v3 j% n  C% u# b! ~
6 [$ ~+ S; O' jphp测试无效
asp/aspx测试成功：
来到/FCKeditor/editor/filemanager/connectors/test.html
因为结合了之前二次上传的漏洞，所以先上传任意内容的文件：asd.asp.txt

burpsuite上传包并修改，repeater
名字改为asd.asp%00txt    然后把%00专为URL编码上传后得到asd(1).asp

如图，webshell为：http://localhost/userfiles/file/asd(1).asp

  A3 z; i7 v/ j& j  ]